You are my hero of the day! It works flawlessly. Over a month of trying and redoing and you have the solution at hand. Thank you so much for your efforts. I will update the files accordingly for future translations with your guide (and maybe screenshots) and put it all together in the first post.

Head of the German Daggerfall translation - www.daggerfalldeutsch.de
and German translator for The Elder Scrolls V: Skyrim and Lore-Expert for The Elder Scrolls: Online

Another note:
I noticed that if im perform the last procedure mentioned above, on the video ANIM0004 this doesn't work !!! ,
almost for me, but if the first method is applied, with drag and drop on ligne and ignored alpha channel this seems work well ..
in addition, there are three lines of translation in the ANIM0004VO.srt file but the ANIM0004.txt file searches and overlays only two screens so it's only 2 images, not 3.
If you write a guide it should be mentioned .

Finished the videos myself now. I (we?) have two videos left ANIM0001 and ANIM0011. I am trying to do them right now by reading through the old thread from our French friends and found this post for ANIM0011. For ANIM0001 I have no idea how to make the contrast of the different frame to make it look like that the text appears and disappears when converting back. These videos are very frustrating, as it is technically so difficult if you are not into Photoshop or anything like that.

When I do it the old way, I get something like that

dfanim0001.PNG (10.04 KiB) Viewed 636 times

Do we really have to rework every frame of this video as it sounds?

Andux wrote:End up remapping them all individually in PSP.

Head of the German Daggerfall translation - www.daggerfalldeutsch.de
and German translator for The Elder Scrolls V: Skyrim and Lore-Expert for The Elder Scrolls: Online

from my research I seem to have understood yes, if you want to translate the Daggerfall Vanilla you have to recreate each frame with color and without transparency levels so as to overlay them with the original video. Infact i haven't translate this video, after all it is a detail so irrelevant for the game ,
but I understand you if you want do it for accuracy , so best wishes for the job
in DFUnity it is obviously easier to recreate an AVI video that completely replaces the original , i think.

edit :
Maybe an alternative solution could be to put a string of text below as in the other videos

Maybe an alternative solution could be to put a string of text below as in the other videos

Well yes, this sounds like the best idea for both videos. Maybe, I will give it a try later, when I really can spare the time. Would really just be for accuracy as you mentioned - not worth it for now. Thanks for looking into that, anyway!

Head of the German Daggerfall translation - www.daggerfalldeutsch.de
and German translator for The Elder Scrolls V: Skyrim and Lore-Expert for The Elder Scrolls: Online